Pipe-threading machine.



W. E. NESTOR. PIPE THREADING MACHINE. APPLICATION HLED 050,28. 1914.

Patented Mai. 28, 1916.

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WITNESSES THE COLUMBIA HANOORAPH 60., W A5HINOTON. D. C.

WILLIAM EDWARD NESTOR, 0F MOORINGSPOBT, LOUISIANA".

PIPE-THREADING MACHINE.

Application filed December 28, 1914. Serial 0. 879,290.

To all whom it may concern: v

Be'it known that 1, WILLIAM E. Nnsron, a citizen of the United States, and .a resident of Mooringsport, in the parish of Caddo and State .of Louisiana, have invented a new and useful Improvement in Pipe 'lhreading Machines, of which the following is a specification.

My invention is an improvement in pipe threading machines, and has for itsobject to providea portable machine of the character specified, especially adapted for cutting threads on large pipes at the place of. their utilization, and wherein the machine may be operated manually, being placed directly on the pipe.

In the drawingsg-Figure 1 is a side view of the improved machine withparts in section, and Fig. 2 is a vertical section through the work holder and die head.

The present embodiment'of the invention isshown in connection with a pipe 1, the taper pin plate 2 fitting over the pipe as shown, and the thread cutting mechanisms 3 of ordinary construction, are supported by the driving, plat iin the usual manner. This mechanism is driven by a shaft 4, which is journaled in a tubular extension 5, connected with the plate '2, and mechanism supported by the plate 2 and the extension 5 is provided for driving the shaft 4'.

A bearing bracket or arm 6 is connected to the plate 2 and the extension, the bracket having at its upper end an angular lug 7, whichis'connected to the plate 2, by, means of an angular brace'8f This brace consists of two portions at-approximately a right angle to each other, one portion'beingconnected to the driving plate by a bolt and nut 9, while the other portion is connected to the lug 7 by a similar bolt. and nut 9.

The bracket arm is provided witha vbearing 10 for the shaft 4, the inner end of the said bearing fitting against the outerend of the extension 5 and beyond the bearing 10 the shaft 4 is provided within squared portion 11, upon which fits the hub of a gear wheel 12. The gear wheel is held in place by means of a'washer 13, and a nut 14, and the bracket 6'is provided with an enlargement 15, intermediate its ends and on its inner face. At the enlargement the bracket has bearings 16 and 17, the former having a bushing 18 fitting therein.

An idler shaft lt) isheld in the bearing 17, and a driving shaft 20 is held in the bushing 18. Asecond bracket 2l is provided for assisting in the support of the shafts l9 and 20, andthe said bracket-has an extension 21*, which engages the outer face of the bracket .6.above the driving shaft 20 to space the body of the bracket away from the bracket 6. i

A bolt G is passed through registering openings in the bracket 6 and in the extension 21, and the bolt is engaged by anut 6", to clamp the bracket 21 to the bracket 6. This bracket 21 is provided with bearings 22 and '23, for receiving the'shafts 19 and 20, respectively, and the latter bearing has a bushing 24. V i I A pinion 25 is journaled on the shaft 19, and a pinion 26 is keyed to the shaft 20, both pinions being between the brackets 6 and 21, the .former pinion being arranged on an enlarged'portion 19 of the shaft 19. The shoulders 'formed at each end of the enlarged portion 19 of the shaft 1.9 engage the outer face of the brackets and the inner end of the bearing 22," respectively, to properly space the lower end of the bracket 21 from the bracket 6. The gear 25, itwill be seen, has an opening for the enlargement 19 of the shaft 19 somewhat greater than the diameter of the saidenlargement, in order to provide proper clearance and there is also a sufficient clearance between the bracket 22 and the bracketifi to permit the free turning of the pinion. At its innerrend the shaft 19 is provided with a head, and its outer end has threaded thereon a nut 27 to hold the parts in proper relative position. i 3 The bearing 23 to th'e'driving shaft 20 has an enlarged portion 28 fitting the bushing, and beyondthe bearing the driving shaft is provided with a reduced tapering shank 29. The shoulder between the enlarged portion 28 and the body of the shank 20 e'ngages the "outer end of the pinion 26 and the inner end of the hub of the pinion engages the outer face of the bracket 6 to pre- Specification of Letters Patent. Patented lIaf, 28, 1916, 7

vent inward movement ofthe shaft, and a washer 30 and anut 31 are arranged on the or pipe 1. The die head 42 and the lead screw 44 are: also integral. and the work holder,

and the gear 33 are threaded internally to receive the lead screw The work holder and gear are turned to a free or running "fit on the oppositeside of the gea-r '33 from the set screws 38 to receive the taper pin. plate 2. The said portion of the. gear wheel. 33 and the-work holder 39 are threaded to i carries the pinion 3i, and these parts are carried around the work as the pinion 34 rotates or revolves around the gear 33wh'tch istixed. The die. head 42 being a freefit over the pinion sleeve 5 is free to travel backand forth on the same, as. the lead screws draw the dies on orotf the pipe 1, as well as'to assist in driving the. dies in connection with the taper pin plate2; The hearings 16,17, 23 and 22have oil holes 35, for permitting the parts to be lubricated and the extension'5 has an oil hole-36 for. the same purpose. handles 45 are provided for carrying the machine, but one of the-said handles being shown.

In operation'the machine is slipped over the pipe to be threaded until the end of the pipe is evenwith the dies 3. Theset screws 38 are then turned to clamp the work holder 39 of the die'on the pipel. The lead screw is provided with as many threads per inch as the pipe-to. be threaded, and the taper pin plate 2 is bored to a running fit over-the bearing 40'of thelarge gear 33. On the driving plate are mounted the four taper pins 41, against which the backs. of the dies 3 rest, and which permit the dies to recede as the lead screw feeds thernon the pipe, thus giving the proper taper to the threaded end of the pipe. The bearing sleeve 5 is threaded into an: opening in the plateiQ, and

the plate 42 ismounted on this sleeve as is also the bearing met the arm 6.

The set screw 37 holdsithe bearing in ad-v justed position with respect to thefbearing.

sleeve '5, this set "screw engaging the outer surface of the sleeve. At the opposite end the arm 6 is held by the angular brace 8,

so thatthe driving strain is divided at the opposite sides of the driving plate. j The driving mechanism isconnected with the taper shank 23, and as the shankturns the pinion 26 turns therewith. driving the, pinion'25 and the gear wheel 12. The shaft turning rotates the pinion .34zand since the gear wheel 33 is fixed-to the pipe the.

Oppositely arranged arm: 6 and the die plate; will; irotat eiabouti the pipe rotating on the axisof the pipe, and the die plate will cause the dies 3 to cut p i thethreads on the pipe. Thus the hand? operated-maehineds converted into a power '70. operated. machine, the power being applied atthe taper shanln Preferably the gear -mechanis1n-1 12+25 and 26 is inclosedby a sectionalcasing, con-1 sistingq-of sections a hinged together to" permit the casing to be placed over the gearing. or to be removedtherefrom. But i'aksin'gle section-4:5 is shown, and the said section; is hinged at 46 to thexother section; The-sec: tions are similar; and when .inielosed posi+ ticn they completely inclose the gearingq Each" section has a perforated l ug 4 adapted to receivea boltiorthe like for holding the sections together: The casing. 45 is shaped to fit the gears;

It will be noted that the die head T42'carries andsupports the dies 3 and inaddition assists in driving them. in connectiongfw-ith" the'taper pin plate 2. The taperapin plate 2: supports the taper pins 541,. thepinion sleeve 5, the pinion 34:, the pinion; shaftt, the brackets or arms 10; and 22,. the gears 12, 25 and 26,.the drive shaft 20, the shaft 1: 19* the bolt 6, the support 58 and the gear. 1'

connection with the die holder v42.

I claim g 1. A pipe threadingmachine, con'ip'ris ing. a work holder adapted to be clamped to the pipe-and provided with an annular series of gear teeth, a lead screw carrying .th'readifn' f f dies and having a threaded engagement wit the work holder, a taper pin plate journaledfor rotation on the work holder andlconr. trolling the recession of the dies, a. bearing? 195 sleeve supported by the taper. pin plate andl havingits axis parallel with .that of the. pipe,- an operatingshaft journaled in-(th bearing sleeve and provided with a pinion:- meshing with the gear teeth, agbracketarm havinga bearingat one end for engaging the outer end of the bearing sleeve/and: having at-the otherend a lug extendingto' ward the taper pin plate, a brace connected at oneend to the lug and at'the other end to the. taper apin plate for supportingth'efi' opposite end offth'eYbracket11arnifroin the: bearing sleeve, said bracketyarm havingpa central bearing, and having-a hearing be-. tween the central bearing and the operating shaft, a driving, shaft jo'urnaled in-theeen': tral bearingand. provided with at taper r shank for engagement byv operating. ;mech-; anism, acountershaft :journaledin'the other bearing," pinionssecured. to the driving shattIand thecountershaft and interme hfl" ingwith each. other,:agear wheel secured to. :v the. operating shaft and meshingwithflthea pinion OfxtllG countershaft, andfasnpportz cover. 45, and assists in driving, thediesin connected with the driving. arm: and, {1w

bearings for the driving shaft and the countershaft and on the opposite sides of the pinions from the bracket arm.

2. A pipe threading machine, comprising a work holder adapted to be clamped to the pipe andprovided with an annular series of gear teeth, a lead screw carrying threading dies and having a threaded engagement with the work holder, a taper pin plate journaled for rotation on the work holder andvcontrolling the recession of the threading dies, a bearing sleeve supported by the taper pin plate and having its axis parallel with that of the pipe, an operating shaft journaled in the bearing sleeve and provided with a pinion meshing with the gear teeth, a bracket arm having a bearing at one end for engaging the outer end of the bearing sleeve and having at the other end a lug extending toward the taper pin plate, a brace connected at one end to the lug and at the other end to the taper pin plate for supporting the opposite end of the bracket arm from the bearing sleeve, said bracket arm having a central bearing, and having a hearing between the central bearing and the operating shaft, a driving shaft journaled in the ,central bearing and provided with a taper shank for engagement by operating mechanism, a counter-shaft journaled in the other bearing, pinions secured to the driving shaft and the countershaft and intermeshing with each other, and a gear wheel secured to the operating shaft and meshing with the pinion ofthe countershaft.

3. A pipe threading machine, comprising a work holder adapted to beclamped to the pipe and provided with an annular series of gear teeth, a lead screw carrying threading dies and having a threaded engagement with the work holder, a taper pin plate journaled for rotation on the work holder and controlling the recession of the threading dies, a bearing sleeve supported by the taper pin plate, and having its axis parallel with that of the pipe, an operating shaft journaled in the bearing sleeve and provided with a pinion meshing with the gear teeth,

a bracket arm having at one end a bearing for engaging the outer end of the bearing sleeve, a brace connecting the opposite end Copies of this patent may be obtained for of the bracket arm to the taper pin plate, a driving shaft journaled in the bracket arm coaxial. with the pipe to be threaded, a countershaft journaled in the bracket arm between the driving shaft and the operating shaft, and a gearing connection between the driving shaft, the countershaft and the operating shaft. 7

4. A. pipe threading machine, comprising in combination with the work holder adapted to be clamped on thepipe and having an annuler series of gear teeth, the lead screw having a threaded engagement with the work holder and carrying threading dies, a taper pin plate-journaled for rotation on the frame and controlling the recession of the threading dies, a bearing sleeve supported by the taper pin plate with its axis parallel to that of the pipe, the operating shaft journaled in the bearing sleeve and having the pinion meshing with the gear teeth, a bracket arm connected detach ably at one end with the bearing sleeve and at the other with the taper pin plate, a

driving shaft journaled in the bracket arm coaxial with the pipe, and provided with means for engagement by operating means to turn-the shaft and a reducing gear connection between the driving shaft'and the operating shaft. a

5. A pipe threading machine, comprising a work holder having means for engaging the pipe to be threaded and provided with a gear ring rigid therewith, a lead screw having threaded engagement with the work holder and carrying threading dies, a taper pin plate journaled to rotate on the work holder and controlling the recession of the dies, said plate and work holder having intel-engaging feeding means, said plate having a bearing sleeve, a driving shaft journaled in the sleeve and having a pinion for engaging the gear ring, a bracket connected with the sleeve and with the plate and supporting an operating shaft, andfa gear connection between the said shaft and the driving shaft.

WILLIAM EDWVARD NESTOR.

Witnesses:

C. H. TABER, J. A. WALDEN.

Washington, D. 0.

five cents each, by addressing the Commissioner of Patents, 

